#pragma ident "$Id$"

//============================================================================
//
//  This file is part of GPSTk, the GPS Toolkit.
//
//  The GPSTk is free software; you can redistribute it and/or modify
//  it under the terms of the GNU Lesser General Public License as published
//  by the Free Software Foundation; either version 2.1 of the License, or
//  any later version.
//
//  The GPSTk is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public
//  License along with GPSTk; if not, write to the Free Software Foundation,
//  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
//
//  Copyright 2004, The University of Texas at Austin
//
//============================================================================
//============================================================================
//
// This software developed by Applied Research Laboratories at the University
// of Texas at Austin, under contract to an agency or agencies within the U.S.
// Department of Defense. The U.S. Government retains all rights to use,
// duplicate, distribute, disclose, or release this software.
//
// Pursuant to DoD Directive 523024
//
// DISTRIBUTION STATEMENT A: This software has been approved for public
//                           release, distribution is unlimited.
//
//=============================================================================

/**
 * @file YumaAlmanacStore.cpp
 * Store Yuma almanac information, and access by satellite and time
 */

#include "YumaAlmanacStore.hpp"
#include "GPSWeekSecond.hpp"

namespace gpstk
{

void YumaAlmanacStore::loadFile(const std::string& filename)
throw(FileMissingException)
{
    try
    {
        YumaStream strm(filename.c_str());
        if (!strm)
        {
            FileMissingException e("File " + filename + " could not be opened.");
            GPSTK_THROW(e);
        }

        YumaHeader header;
        strm >> header;
        addFile(filename, header);

        YumaData rec;
        while(strm >> rec)
        {
            // If the user has indcated a time of interest and
            // the reference week number is less than 10 bits long,
            // assume the almanac must be within 511 weeks of the
            // time of interest
            // If necessary, adjust the GPS week number
            if (timeOfInterest>CommonTime::BEGINNING_OF_TIME &&
                    rec.week < 1024)
            {
                short diff = GPSWeekSecond(timeOfInterest).week - rec.week;
                short nEpochs = (diff+512) / 1024;
                rec.week += nEpochs * 1024;
            }
            addAlmanac(AlmOrbit(rec));
        }
    }
    catch (Exception& e)
    {
        GPSTK_RETHROW(e);
    }
}

}
